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A negative electrode material for a high-capacity and long-life ternary lithium-ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of serious high-capacity ternary battery application and industrialization, poor processing performance of negative electrode slurry, and short battery life, etc. Achieve excellent charge and discharge stability, improve compaction density and improve service life

Active Publication Date: 2020-12-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the mainstream high-capacity and high-pressure graphite anodes currently on the market, most of them are processed by secondary granulation technology. The gram capacity of this kind of artificial graphite can reach more than 360mAh / g, and the compacted density is 1.75g / cc. Due to the nature of graphite itself, the lithium-ion battery decays linearly during the cycle, and the life of the battery is short; at the same time, the processing performance of the negative electrode slurry is poor, and the wet method of slurry will cause sedimentation, which is serious for the application of high-capacity ternary batteries. and industrialization

Method used

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  • A negative electrode material for a high-capacity and long-life ternary lithium-ion battery
  • A negative electrode material for a high-capacity and long-life ternary lithium-ion battery
  • A negative electrode material for a high-capacity and long-life ternary lithium-ion battery

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Embodiment 1

[0022] The negative electrode material of a high-capacity and long-life ternary lithium-ion battery proposed by the present invention is composed of the following raw material components: 92% composite graphite, 2.5% modified hydroxymethyl cellulose lithium, 2.5% conductive carbon black and 3% SBR.

[0023] Among them, composite graphite is composed of mesophase carbon microspheres (MCMB) and artificial graphite according to the mass ratio of 6:4; the particle size of mesophase carbon microspheres D 50 The range is 5 μm; artificial graphite is graphite after secondary granulation treatment, particle size D 50 The range is 15 μm.

[0024] Wherein, the structural formula of modified hydroxymethyl cellulose lithium is:

[0025]

[0026] R is -OH, and the degree of substitution is 0.8.

[0027] Preparation of the negative electrode pole piece: (1) Slurry: Glue the modified hydroxymethyl cellulose lithium, then add conductive carbon black, stir evenly, then add composite grap...

Embodiment 2

[0029] The negative electrode material of a high-capacity and long-life ternary lithium-ion battery proposed by the present invention is composed of the following raw material components: 97% composite graphite, 1% modified hydroxymethyl cellulose lithium, 1% conductive carbon black and 1% SBR.

[0030] Among them, composite graphite is composed of mesophase carbon microspheres and artificial graphite according to the mass ratio of 3:7; the particle size of mesophase carbon microspheres is D 50 The range is 10μm; artificial graphite is graphite after secondary granulation treatment, particle size D 50 The range is 20 μm.

[0031] Wherein, the structural formula of modified hydroxymethyl cellulose lithium is:

[0032]

[0033] R is for -OOCH 3 , the degree of substitution is 0.9.

[0034] Preparation of the negative electrode pole piece: (1) Slurry: Glue the modified hydroxymethyl cellulose lithium, then add conductive carbon black, stir evenly, then add composite graphi...

Embodiment 3

[0036] The negative electrode material of a high-capacity and long-life ternary lithium-ion battery proposed by the present invention is composed of the following raw material components: 89% composite graphite, 3% modified hydroxymethyl cellulose lithium, 3% conductive carbon black and 5% SBR.

[0037] Among them, composite graphite is composed of mesophase carbon microspheres and artificial graphite according to the mass ratio of 5:5; the particle size of mesophase carbon microspheres is D 50 The range is 15μm; artificial graphite is graphite after secondary granulation treatment, particle size D 50 The range is 25 μm.

[0038] Wherein, the structural formula of modified hydroxymethyl cellulose lithium is:

[0039]

[0040] R for -SO 3 H, the degree of substitution is 0.6.

[0041] Preparation of the negative electrode pole piece: (1) Slurry: Glue the modified hydroxymethyl cellulose lithium, then add conductive carbon black, stir evenly, then add composite graphite, ...

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Abstract

The invention discloses a negative electrode material with high capacity and long life of a ternary lithium-ion battery and relates to the technical field of lithium-ion batteries. The negative electrode material comprises the following raw material components: composite graphite, modified lithium hydroxymethyl cellulose, a conductive agent and a binder, wherein the composite graphite is formed bycompounding mesocarbon microbeads and synthetic graphite. The mesocarbon microbeads and the synthetic graphite are compounded for use, so that the characteristics of excellent charge-discharge stability, high reversible specific capacity and long service life of the mesocarbon microbeads can be developed, the characteristics of high capacity and low rebound of the synthetic graphite, especially the synthetic graphite subjected to secondary granulation can be taken into account, and the slurry sedimentation phenomenon of the synthetic graphite can be improved by adopting the synergistic effectof the modified lithium hydroxymethyl cellulose. The negative electrode material has the characteristics of high capacity and high compactness, the life of the ternary lithium-ion battery is prolonged and the application range and industrialization are further expanded.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a negative electrode material for a high-capacity and long-life ternary lithium-ion battery. Background technique [0002] With the development of new energy vehicles, the energy density of a single battery is required to be ≥300Wh / Kg, and the development of high-safety, long-life, high-energy-density lithium-ion batteries has become the main goal of the development of power lithium batteries. In addition to the high-nickel ternary material with high gram capacity for the positive electrode of the high-energy-density lithium-ion battery, the negative electrode material also needs to match the graphite negative electrode with high capacity, high compaction, and low rebound. [0003] For the mainstream high-capacity and high-pressure graphite anodes currently on the market, most of them are processed by secondary granulation technology. The gram capacity of this kind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 李婷婷王光俊陈炜张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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